mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-05 19:10:13 +00:00
185f812c41
Sphinx expects Return: and not @return to indicate a return value. find . -name '*.c' -exec \ sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \; find . -name '*.h' -exec \ sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \; Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
227 lines
5.5 KiB
C
227 lines
5.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
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/*
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* Copyright (C) 2019, STMicroelectronics - All Rights Reserved
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*/
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#define LOG_CATEGORY UCLASS_REMOTEPROC
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <fdtdec.h>
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#include <log.h>
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#include <remoteproc.h>
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#include <reset.h>
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#include <asm/io.h>
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#include <dm/device_compat.h>
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#include <linux/err.h>
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/**
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* struct stm32_copro_privdata - power processor private data
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* @reset_ctl: reset controller handle
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* @hold_boot: hold boot controller handle
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* @rsc_table_addr: resource table address
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*/
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struct stm32_copro_privdata {
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struct reset_ctl reset_ctl;
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struct reset_ctl hold_boot;
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ulong rsc_table_addr;
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};
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/**
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* stm32_copro_probe() - Basic probe
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* @dev: corresponding STM32 remote processor device
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* Return: 0 if all went ok, else corresponding -ve error
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*/
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static int stm32_copro_probe(struct udevice *dev)
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{
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struct stm32_copro_privdata *priv;
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int ret;
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priv = dev_get_priv(dev);
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ret = reset_get_by_name(dev, "mcu_rst", &priv->reset_ctl);
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if (ret) {
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dev_err(dev, "failed to get reset (%d)\n", ret);
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return ret;
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}
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ret = reset_get_by_name(dev, "hold_boot", &priv->hold_boot);
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if (ret) {
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dev_err(dev, "failed to get hold boot (%d)\n", ret);
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return ret;
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}
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dev_dbg(dev, "probed\n");
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return 0;
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}
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/**
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* stm32_copro_device_to_virt() - Convert device address to virtual address
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* @dev: corresponding STM32 remote processor device
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* @da: device address
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* @size: Size of the memory region @da is pointing to
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* Return: converted virtual address
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*/
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static void *stm32_copro_device_to_virt(struct udevice *dev, ulong da,
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ulong size)
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{
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fdt32_t in_addr = cpu_to_be32(da), end_addr;
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u64 paddr;
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paddr = dev_translate_dma_address(dev, &in_addr);
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if (paddr == OF_BAD_ADDR) {
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dev_err(dev, "Unable to convert address %ld\n", da);
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return NULL;
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}
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end_addr = cpu_to_be32(da + size - 1);
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if (dev_translate_dma_address(dev, &end_addr) == OF_BAD_ADDR) {
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dev_err(dev, "Unable to convert address %ld\n", da + size - 1);
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return NULL;
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}
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return phys_to_virt(paddr);
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}
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/**
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* stm32_copro_load() - Loadup the STM32 remote processor
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* @dev: corresponding STM32 remote processor device
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* @addr: Address in memory where image is stored
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* @size: Size in bytes of the image
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* Return: 0 if all went ok, else corresponding -ve error
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*/
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static int stm32_copro_load(struct udevice *dev, ulong addr, ulong size)
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{
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struct stm32_copro_privdata *priv;
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ulong rsc_table_size;
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int ret;
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priv = dev_get_priv(dev);
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ret = reset_assert(&priv->hold_boot);
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if (ret) {
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dev_err(dev, "Unable to assert hold boot (ret=%d)\n", ret);
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return ret;
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}
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ret = reset_assert(&priv->reset_ctl);
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if (ret) {
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dev_err(dev, "Unable to assert reset line (ret=%d)\n", ret);
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return ret;
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}
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if (rproc_elf32_load_rsc_table(dev, addr, size, &priv->rsc_table_addr,
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&rsc_table_size)) {
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priv->rsc_table_addr = 0;
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dev_warn(dev, "No valid resource table for this firmware\n");
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}
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return rproc_elf32_load_image(dev, addr, size);
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}
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/**
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* stm32_copro_start() - Start the STM32 remote processor
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* @dev: corresponding STM32 remote processor device
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* Return: 0 if all went ok, else corresponding -ve error
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*/
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static int stm32_copro_start(struct udevice *dev)
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{
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struct stm32_copro_privdata *priv;
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int ret;
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priv = dev_get_priv(dev);
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ret = reset_deassert(&priv->hold_boot);
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if (ret) {
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dev_err(dev, "Unable to deassert hold boot (ret=%d)\n", ret);
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return ret;
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}
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/*
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* Once copro running, reset hold boot flag to avoid copro
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* rebooting autonomously (error should never occur)
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*/
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ret = reset_assert(&priv->hold_boot);
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if (ret)
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dev_err(dev, "Unable to assert hold boot (ret=%d)\n", ret);
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/* indicates that copro is running */
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writel(TAMP_COPRO_STATE_CRUN, TAMP_COPRO_STATE);
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/* Store rsc_address in bkp register */
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writel(priv->rsc_table_addr, TAMP_COPRO_RSC_TBL_ADDRESS);
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return 0;
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}
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/**
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* stm32_copro_reset() - Reset the STM32 remote processor
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* @dev: corresponding STM32 remote processor device
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* Return: 0 if all went ok, else corresponding -ve error
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*/
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static int stm32_copro_reset(struct udevice *dev)
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{
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struct stm32_copro_privdata *priv;
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int ret;
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priv = dev_get_priv(dev);
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ret = reset_assert(&priv->hold_boot);
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if (ret) {
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dev_err(dev, "Unable to assert hold boot (ret=%d)\n", ret);
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return ret;
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}
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ret = reset_assert(&priv->reset_ctl);
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if (ret) {
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dev_err(dev, "Unable to assert reset line (ret=%d)\n", ret);
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return ret;
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}
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writel(TAMP_COPRO_STATE_OFF, TAMP_COPRO_STATE);
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return 0;
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}
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/**
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* stm32_copro_stop() - Stop the STM32 remote processor
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* @dev: corresponding STM32 remote processor device
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* Return: 0 if all went ok, else corresponding -ve error
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*/
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static int stm32_copro_stop(struct udevice *dev)
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{
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return stm32_copro_reset(dev);
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}
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/**
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* stm32_copro_is_running() - Is the STM32 remote processor running
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* @dev: corresponding STM32 remote processor device
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* Return: 0 if the remote processor is running, 1 otherwise
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*/
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static int stm32_copro_is_running(struct udevice *dev)
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{
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return (readl(TAMP_COPRO_STATE) == TAMP_COPRO_STATE_OFF);
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}
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static const struct dm_rproc_ops stm32_copro_ops = {
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.load = stm32_copro_load,
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.start = stm32_copro_start,
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.stop = stm32_copro_stop,
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.reset = stm32_copro_reset,
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.is_running = stm32_copro_is_running,
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.device_to_virt = stm32_copro_device_to_virt,
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};
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static const struct udevice_id stm32_copro_ids[] = {
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{.compatible = "st,stm32mp1-m4"},
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{}
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};
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U_BOOT_DRIVER(stm32_copro) = {
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.name = "stm32_m4_proc",
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.of_match = stm32_copro_ids,
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.id = UCLASS_REMOTEPROC,
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.ops = &stm32_copro_ops,
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.probe = stm32_copro_probe,
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.priv_auto = sizeof(struct stm32_copro_privdata),
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};
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